Apparatus for indicating and recording pressure exerted in presses.



- P. JOHN. APPARATUS FOR INDIGATING AND RECORDING PRESSURES EXERTED INPRESSES.

APPLICATION FILED JAN. 30, 1914- Patented Dec. 22, 1914.

2 SHEET$SHEET l.

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INVENTOR jaw 7141 5,

WITNESSES:

P. JOHN. APPARATUS FOR INDIOATING AND RECORDING PRESSUEES EXERTED INPRESSES.

APPLIOATION FILED JAN. 30, 1914.

2 SHEETSSHEET 2.

INVENTOR WITNESSES:

TTFU @TATFd PATENT UFFTFF.

FERDINAND JOHN, OF ST. OUEN, FRANCE, ASSTGN'OJR. '1() E. W. BLISSCOMPANY, F

\ BROOKLYN, NEW YORIQA CORPORATION OF WEST VIRGINIA.

APPARATTTS FOR INDICATING AND RECORDING PRESSURES EXERTED IN PRESSES.

Specification of Letters Patent.

Patented Dec. 22, 191d,

Application flied January 80, 1914. Serial No. 815,388.

. present constructed the pressures produced attain considerable values.At the working end of the stroke of the crank-shaft the ratio of thearms of the levers of power and of resistance increases to infinity andallows'the belt and the cogs which actuate the press to transmit aneffort very superior to that which the frame, the shaft or the otherparts of this press can support. As

i the workman who mounts the tools upon a machine has no means of takingaccount of the pressures developed he runs the risk of bringing aboutthe rupture of the frame or the bending or torsion of the shaft.

The present invention has for an object the remedying of these troublesby allowing the workman to know at each instant the efiect developed,and to avoid, consequently reaching dangerous value.

This invention relates to a device for indicating the effort developedat each instant by a press by measurin the elongation of the framethereof, or the displacement of one portion of the frame relatively toanother portion under the efiort of the' pres sure produced.

The invention is represented, but only by way of example, in the annexeddrawing, in which;

Figure l is an elevation of the ensemble of the device applied to astamping press. Fig. 2 is aface view, on a larger scale, of theindicating device. Fig. 3 is a side view and Fig. 4 a corresponding viewin plan. Fig. 5 represents the. indicator open.

My improvement is illustrated herein in connection with a press, thebase portion 8 of which is shown carrying the bed plate u of the press.Standards 4) are shown bolted to the base 8 and between the upperportion t and the standards '0 a bearing 1s provided for the crank shaft'w which operates the slide or movable member an of the press in itscoiiperation with the bed plate u. The movable mem er to is shownconnected to the crank shaft by means of a suitable connecting member 3In operation the pressure exerted by the crank shaft between the membersw and u will tend to elongate the frame of the press which is shownconnected 7 together by means of tie-bolts la whereby in the working ofthe press the portion c'arrying the bearing for the crank shaft, andparticularly the upper portion at thereof, is movable relatively to thebase portion .9. A rod a is shown connected to the upper portion t ofthe press by means of an attaching member I). See particularly Fig. 3.This rod is shown passing through a number of guides c for maintainingit absolutely rectilinear.

U on the lower portion of the rod is rigi ly fixed an arm at (Fig. 5).Into this arm is screwed a bolt e provided with a counter-nut f, whichpermits of renderin the bolt immovable at the position desired in thearm 11. The head 9 of. this bolt acts upon a rod h which furnishes arack meshing with the wheel controlling an indicating mechanismcomprising a hand 2' which is displaced in front of a dial 3'. This dialcarries a graduation, the divisions of which correspond to variouselongations of the frame. The train of toothed wheels transmitting themovement of the rack to the hand is designed to enlarge this movement soas to render it easily readable upon the dial j. At each stroke of thepress the frame elongates. In the case of the press represented, theframe of which is formed of several pieces of cast iron assembled by loninternal stays in (Fig. 1) with screws at their extremities, these stayselongating from below upward. The elongation is maximum at the pointwhere the stop 6 is fixed. This stop rising with the u per part of theframe carries along the rod a. The lower part of this rod, .through theintermediatlon' of the cross-piece d and the bolt 6,

I pressure which the slide of the press exerts upon the object to beworked.

The lower portion of the rod a, and all the parts which produce movementin the hand 4', are inclosed in a box Z fastened by means ofscrews m(Fig. 3) upon the frame of the press at a point well in sight of theWorkman. This box can be opened when it is desired to clean or lubricateits internal parts. In order that these latter may be protected frommutilation through malice or any other reason, the opening of the box isprevented at ordinary times by a bar 71. with a padlock o the key ofwhich remains in the possession of the foreman or chief of the workshopof the factory.

The front of the box Z shows in front of the dial j a glass opening p;below there is fixed a metal plate q upon which, as Fig. 2 indicates,there is engraved the number of the press, the pressure which representsthe experimental load which has served to test the solidity of the pressand the normal limit pressure which should not be exceeded in use. Inorder to be able to verify whether, in the course of the work, thisnormal limit pressure has not been attained or exceeded, there isarranged upon the same axis of rotation as with the hand i a second hand1' (Fig. 2) which can be carried along by the hand 2', but which stopsat the point of the dial which this latter has reached, withoutreturning like it to the zero of the division of this dial. It is theneasy by means ofthis second control hand to see what is the highestpressure which has been reached during a certain work; by opening thebox this second hand can be set back to zero.

As is usual with manometers there can be marked upon the dial 7', by ared line plainly Visible, the normal limit pressure which is not to beexceeded. Besides this indication of limit pressure of safety it isunderstood that the dial which carries the graduation from zero to thislimit pressure and beyond can serve for the regulation of the press forcausing it. to give any pressure whatever comprised between zero and itslimit pressure. The bolt 6, variable imposition, serves, at the time ofsetting up the device, for correcting the strains which might preventthe hand 2' from returning to zero when at rest.

Of course the invention is applicable to all other machines besides thepress represented, the frame being capable also of being of a singlepiece or of several pieces.

The arrangements described are given only by way of example; the shapes,dimensions and arrangements of detail can vary according tocircumstances without changing the principle of the invention.

Summing up, the invention has for its ob- 'ect:

] 1. In a device of the character specified the combination with a pressframe having a portion which is movable relatively to another portionthereof responsive to the working pressure of the press, an indicatorcarried by one of the said frame portions and a rod having one endfastened to the other of the said frame portions, and the other endoperatively connected to the indicator.

The combination with a press comprising a frame having a base portion,the bed plate of the press carried thereby and an upstanding portionformed with a shaftbearing, a crank shaft mounted in such bearing, themovable member of the press cooperative with the bed plate carried bysuch crank-shaft, the said bearing portion being movable relatively tothe base portion incident to the working of the press, an indicatorcarried by one of the said portions, and a rod having one end fastenedto the other of the said portions, and operatively connected to theindicator.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

FERDINAND JOHN.

Witnesses:

ARTHUR WILZIE, HANSON C. Coxn.

